We are glad that you were able to fix one of your issues. Regarding move your installation to the root url, you can do it running
sudo INSTALLDIR/wordpress/bnconfig --appurl /
after that, you can access your WordPress installation using http://IPaddress instead of http://IPaddress/wordpress. Please, replace the
INSTALLDIR placeholder by the path to your installation.
Please note that this command only works to pass the URL to the root, if you want to reverse the change you should configure Apache to do it. I mean if after the change you want to return to http://IPaddress/wordpress, you cannot execute
sudo /opt/bitnami/apps/wordpress/bnconfig --appurl /wordpress
this command only moves the URL to the root.
I hope this information is useful to you. If you have any other question, please do not hesitate to let us know.
Carlos R. Hernández